Lozinsky Virus

 Virus Name:  Lozinsky 
 Aliases:     Lozinsky-1018, Lozinsky-1023B 
 V Status:    Rare 
 Discovered:  December, 1990 
 Symptoms:    .COM file growth; file date/time changes; decrease in total 
              system and available free memory 
 Origin:      USSR 
 Eff Length:  1,023 Bytes 
 Type Code:   PRtCK - Parasitic Resident .COM Infector 
 Detection Method:  ViruScan, AVTK, F-Prot, NAV, Sweep, ChAV, 
                    IBMAV, NAVDX, VAlert, PCScan, 
                    NShld, LProt, Sweep/N, Innoc, NProt, AVTK/N, 
                    NAV/N, IBMAV/N 
 Removal Instructions:  Delete infected programs 
 General Comments: 
       The Lozinsky virus was submitted in December, 1990 from the USSR. 
       Lozinsky is a memory resident infector of .COM files, including 
       When the first program infected with Lozinsky is executed, the virus 
       will install itself memory resident at the top of system memory but 
       below the 640K DOS boundary.  Interrupt 12's return will be moved so 
       that the system will report 2,048 bytes of memory less than what is 
       actually installed.  Interrupts 13 and 21 will be hooked by the 
       virus.  COMMAND.COM will also become infected at this time. 
       After Lozinsky is memory resident, it will infect .COM files which 
       are executed or opened for any reason.  Infected programs will show 
       a file length increase of 1,023 bytes and have the virus located at 
       the end of the program.  Their date and time in the disk directory 
       will also have been updated to the system date and time when the 
       program was infected by Lozinsky. 
       It is unknown if Lozinsky does anything besides replicate. 
       Known variant(s) of Lozinsky are: 
       Lozinsky-1018: Functionally similar to the original Lozinsky 
                      virus, this variant is five bytes smaller, adding 
                      1,018 bytes to the end of files it infects. 
                      Origin: Unknown  November, 1991 
       Lozinsky-1023B: Functionally equivalent to the original virus, 
                       this variant has two bytes within its viral code 
                       which differ. 
                       Origin: Unknown  November, 1991 
       See:   Zherkov 

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